| 摘要 |
PURPOSE: To diminish the composition of a circuit, by comparing output data introduced from a counter means in inverse order, with rotational speed data, and by controlling the duty of output. CONSTITUTION:By a latch circuit 10, digital speed signal DI is retained. By a counter 12, the output of the count signal C' of the bits of a count C arranged in inverse order is generated. By a digital comparator 11, the speed signal DI and the count signal C' are compared with each other, and when the speed signal DI is greater than the count signal C', then speed signal D0 is set to be 'H', and when the speed signal DI is equal to or less than the count signal C', then the speed signal D0 is set to be 'L', and the output is directed to a flipflop 13. By the flipflop 13, based on clock signal, the speed signal D0 is shaped in a specified pulse width, and the output is directed to a motor driver 3 via a low frequency circuit 2. |
